Plaster division-strip.



G. S. KNAPP.

PLASTER DIVISION STRIP. 4 APPLICATION FILED JUNE 3, 1911.

Patented Jan. 30, 1912.

Z" messes;

GEORGE S. KNAPP, OF LA GRANGE, ILLINOIS.

PLASTER DIVISION-STRIP.

Specification of Letters Patent.

Patented Jan. 30, 1912.

Application filed June 3, 1911. Serial No. 631,069.

To all whom it may concern:

Be it known that I, GEORGE S. KNAPP, a citizen of the United States, residing at La Grange, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Plaster Division- Strips, of which the following is a specification.

My invention relates to improvements in plaster division strips, known'in the art as grounds for plasterers.

One of the salient objects of my invention is to provide a strip, preferably metallic, to form a boundary, or finish margin, or ground for plastered walls, and of such configuration as to provide a lock and protectionfor the plaster material, first to be finished to the strip, and an independent, uncommunicating partition and lock for the subsequently applied material.

In the construction of modern fire-proof buildings, it is usual to make the floors of some fire-proof, plastic material, such as a sanitary fire-proof mixture or tinted cement mortar, or other like substance that is applied in a plastic state and which subsequently sets andcbecomes hardened, said material being, usually, continued up the surrounding vertical walls to form the, socalled, base board or dado. In such constructions, it is very desirable to have a means for clearly defining the boundary or limit to which the material shall extend vertically and longitudinally along the walls, and to also provide grounds for the plaster coating.

In using my strip, it is secured to the wall, as by nails or the like, at a uniform height and around the room to afford a stop or marginal limit and ground for the application of the plastic material, constituting the dado or base board, and before the application of such material. Or it may first constitute a stop or marginal limit for the superposed plaster to be contained on the wall above the strip and prior to the application of the material constituting the floor and base board or dado. In either event, it serves as a ground and a marginal protection for the finished wall and constitutes a dividing imperforate partition and protection of the materials of which the respective portions of the wall are composed.

In the drawing, Figure 1 shows a sectional view of a wall and floor of plastic materials with my divisional strip in place; Fig. 2 shows a side view of a portion of the strip; and Fig. 3 is a plan view of the blank from which my strip is formed.

In all of the views, the same reference characters indicate similar parts.

The strip 5 is, preferably, composed of sheet metal, such as galvanized iron or the like; is shown rather exaggerated, in thickness, in Fig. 1, for the purpose of clearer illustration; but in practice, is preferably made of strips of galvanized iron N0. 18 or 20, folded longitudinally within its middle zone, the fold forming a nose or projecting web, as at 6. This part of the structure proj ects laterally or forwardly as an overhanging ledge to provide a key or dove-tail cavity, as at 7, which is to be filled with the plaster, below the strip, as shown, and which serves to key and retain the plaster in place in its relation to the wall.

The nose 6 serves as a surface or ground to which the plaster walls are to be finished. The distance from the outer surface of the nose to the terminal of the parts 8 and 9, above and below the nose, equals the thickness of the applied plaster.

The upper wall 10 of the nose portion is perforated as at 11, to provide openings through which the plaster above the strip may key, whereby the plaster is firmly held by the strip, thus providing, by the use of the strip, means by which a sharp line of demarcation is afforded for the plaster first applied, and whereby the marginal edge of said plaster is securely held and protected until the application of the adjoining plastic material, and providing grounds for determining the thickness of the applied plaster.

The plaster 12 above the strip may, and usually does, contain lime, or other material, that would have a deleterious effect upon the plaster 13 below, if in actual contact therewith, which latter may be of other material than cement, and may contain delicate coloring matter susceptible to discoloration by the influence of lime or other material, and, therefore, I provide an imperforate wall 14L as an integral part of the strip, and as a separator between the materials on either side thereof. The wall 15 is also imperforate and in conjunction with the wall 14. provides a water proof separating mediiun.

It will be observed that the terminals 8 and 9 of the strip do not lie fiat against the wall or structure to which the plaster is to A be applied but that they are angularly disposed to the vertical plane of such supporting structure. By changing the angle, as by bending the fingers 8, the strip may be thus made to serve as grounds for applied plaster of varying thickness within its capacity. It is not necessary that all of the fingers shall be so bent, prior to its application, as other intermediate fingers may be nailed to place after the first have been so fixed, if desired.

The angle at which the strip is bent constitutes an arch affording greater strength to the strip than would obtain if the angulated walls were flat or parallel with the supporting structure.

The strip may conveniently be provided with perforations 8' and 9 for the reception of nails 16, by which it is secured to the sup porting wall structure 17.

My strip may be used in other situations than that described, and. may be employed for other purposes than a divisional separator between coatings of plaster. As an example, the part 13 may be of wood or other material, and may be conveniently applied after the superposed plaster has been finished to the strip, as will be readily understood, and the configuration of the nose need not conform to the precise exemplification disclosed in the drawing.

lVhile I have described a single embodiment of my invention, it is evident that many changes as above may be made in the contour and relation of the parts of the structure without departing from the spirit and scope of the invention as defined in the appended claims.

lVhat I claim is:

1. A plaster division strip of sheet metal having as its most forward part a nose, formed by folding the strip and constituting the line of division between the front faces of an upper and a lower plaster body, the

' strio arovidin one wall extendin from said nose backwardly and upwardly to the vertical plane of the rear face of said plaster bodies, and another wall extending from said nose backwardly and upwardly at a lesser angle to a horizontal plane and thence backwardly and downwardly to said rear vertical plane.

2. A plaster division strip of sheet metal having as its mostforward part a nose, formed by folding the strip and constituting the line of division between the front faces of an upper and a lower plaster body, said strip providing a lower wall portion extending from said nose backwardly and upwardly to form an overhanging nose to lock said lower plaster body.

3. An article of manufacture comprising a sheet metal strip having base parts in different angular planes, an intermediate part provided by the strip being folded upon itself to form a laterally projecting nose, one wall whereof is perforated whereby to key the plaster.

l. An article of manufacture comprising a sheet metal strip having two angularly disposed attaching parts in different planes, one of said parts perforated to provide plaster locking means above the nose, and an intermediate part projecting backwardly and upwardly therefrom to form an overhanging nose to provide plaster locking means below the nose.

5. A plaster division strip of sheet metal having as its most forward part a nose formed by folding the strip and constituting the line of division between the front faces of an upper and a lower plaster body, said strip having an upper wall extending backwardly and upwardly from said nose to the vertical plane of the rear face of said plaster bodies, said wall having perforations near the nose to provide keying means for the overhanging plaster body, and said strip having a lower wall portion extending backwardly and upwardly from the-nose at a lesser angle to a horizontal plane to provide an overhanging nose to lock said lower plaster body.

6. A plaster division strip of sheet metal having as its most forward part a nose formed by folding the strip and constituting the line of division between the front faces of an upper and a lower plaster body, said strip having an upper wall extending from said nose to the vertical plane of the rear face of said plaster bodies for attachment adjacent said plane to a support, and a lower wall extending backwardly and deflected upwardly above the horizontal plane of the lower edge of said nose and extending rearwardly from said deflected portion for attachment adjacent said rear vertical plane to a support.

7. A plaster division strip of sheet metal having as its most forward part a nose formed by folding the strip and constituting the line of division between the front faces of an upper and a lower plaster body, said strip having upper and lower walls extending bacliwardly from said nose at different inclinations to a horizontal plane, to provide therebetween a space, one wall be ing perforated for keying of plaster into said space.

in testimony whereof I hereunto set my hand in the presence of two witnesses.

GEORGE S. KNAPP.

In the presence of MARY F. ALLEN, W. LINN ALLEN.

flopies of this patent may be obtained for five cents each, by addressin Washington, D. C.

g the Commissioner of Patents, 

